doc(): updated changelog

CHANGELOG.md

@@ -5,7 +5,7 @@
 * **Graph**: Adds sort order options for graph tooltip, closes  [#1189](https://github.com/grafana/grafana/issues/1189)
 * **Theme**: Add default theme to config file [#5011](https://github.com/grafana/grafana/pull/5011)
 
-# 3.0.2 Stable (unreleased)
+# 3.0.2 Stable (2016-05-16)
 
 * **Templating**: Fixed issue mixing row repeat and panel repeats, fixes [#4988](https://github.com/grafana/grafana/issues/4988)
 * **Templating**: Fixed issue detecting dependencies in nested variables, fixes [#4987](https://github.com/grafana/grafana/issues/4987), fixes [#4986](https://github.com/grafana/grafana/issues/4986)